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Fix New-Item to create symlink to relative path target #12797

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Merged
adityapatwardhan merged 4 commits into from
Jun 1, 2020
Merged

Fix New-Item to create symlink to relative path target #12797

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1c0b49a
Fix New-Item to create symlink to relative path target
iSazonov May 26, 2020
1fcb371
Fix MacOs test
iSazonov Jun 1, 2020
906b318
Fix MacOs test 2
iSazonov Jun 1, 2020
f2b56f7
Normalize relative path
iSazonov Jun 1, 2020
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18 changes: 15 additions & 3 deletions 18 src/System.Management.Automation/namespaces/FileSystemProvider.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -2361,12 +2361,24 @@ protected override void NewItem(
// non-existing targets on either Windows or Linux.
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try
{
exists = GetFileSystemInfo(strTargetPath, out isDirectory) != null;

// Pretend the target exists if we're making a symbolic link.
if (itemType == ItemType.SymbolicLink)
{
exists = true;

var normalizedTargetPath = strTargetPath;
if (strTargetPath.StartsWith(".\\", StringComparison.OrdinalIgnoreCase) ||
strTargetPath.StartsWith("./", StringComparison.OrdinalIgnoreCase))
{
normalizedTargetPath = Path.Join(SessionState.Internal.CurrentLocation.ProviderPath, strTargetPath.AsSpan().Slice(2));
}

GetFileSystemInfo(normalizedTargetPath, out isDirectory);

strTargetPath = strTargetPath.Replace(StringLiterals.AlternatePathSeparator, StringLiterals.DefaultPathSeparator);
}
else
{
exists = GetFileSystemInfo(strTargetPath, out isDirectory) != null;
}
}
catch (Exception e)
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63 changes: 61 additions & 2 deletions 63 test/powershell/Modules/Microsoft.PowerShell.Management/New-Item.Tests.ps1
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Expand Up @@ -268,12 +268,71 @@ Describe "New-Item with links" -Tags @('CI', 'RequireAdminOnWindows') {
}
}

Describe "New-Item: symlink with absolute/relative path test" -Tags @('CI', 'RequireAdminOnWindows') {
BeforeAll {
# on macOS, the /tmp directory is a symlink, so we'll resolve it here
$TestPath = $TestDrive
if ($IsMacOS)
{
$item = Get-Item $TestPath
$dirName = $item.BaseName
$item = Get-Item $item.PSParentPath -Force
if ($item.LinkType -eq "SymbolicLink")
{
$TestPath = Join-Path $item.Target $dirName
}
}

Push-Location $TestPath
$null = New-Item -Type Directory someDir
$null = New-Item -Type File someFile
}

AfterAll {
Pop-Location
}

It "Symlink with absolute path to existing directory behaves like a directory" {
New-Item -Type SymbolicLink someDirLinkAbsolute -Target (Convert-Path someDir)
Get-Item someDirLinkAbsolute | Should -BeOfType System.IO.DirectoryInfo
}

It "Symlink with relative path to existing directory behaves like a directory" {
# PowerShell should normalize '.\someDir' to './someDir' as needed.
New-Item -Type SymbolicLink someDirLinkRelative -Target .\someDir
Get-Item someDirLinkRelative | Should -BeOfType System.IO.DirectoryInfo
}

It "Symlink with absolute path to existing file behaves like a file" {
New-Item -Type SymbolicLink someFileLinkAbsolute -Target (Convert-Path someFile)
Get-Item someFileLinkAbsolute | Should -BeOfType System.IO.FileInfo
}

It "Symlink with relative path to existing file behaves like a file" {
New-Item -Type SymbolicLink someFileLinkRelative -Target ./someFile
Get-Item someFileLinkRelative | Should -BeOfType System.IO.FileInfo
}
}

Describe "New-Item with links fails for non elevated user if developer mode not enabled on Windows." -Tags "CI" {
BeforeAll {
# on macOS, the /tmp directory is a symlink, so we'll resolve it here
$TestPath = $TestDrive
if ($IsMacOS)
{
$item = Get-Item $TestPath
$dirName = $item.BaseName
$item = Get-Item $item.PSParentPath -Force
if ($item.LinkType -eq "SymbolicLink")
{
$TestPath = Join-Path $item.Target $dirName
}
}

$testfile = "testfile.txt"
$testlink = "testlink"
$FullyQualifiedFile = Join-Path -Path $TestDrive -ChildPath $testfile
$TestFilePath = Join-Path -Path $TestDrive -ChildPath $testlink
$FullyQualifiedFile = Join-Path -Path $TestPath -ChildPath $testfile
$TestFilePath = Join-Path -Path $TestPath -ChildPath $testlink
$developerModeEnabled = (Get-ItemProperty HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\AppModelUnlock -ErrorAction SilentlyContinue).AllowDevelopmentWithoutDevLicense -eq 1
$minBuildRequired = [System.Environment]::OSVersion.Version -ge "10.0.14972"
$developerMode = $developerModeEnabled -and $minBuildRequired
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